UK Anti-Doping (UKAD) has condemned hackers for leaking the medical records of athletes, citing "unnecessary and unwarranted worry".
Olympic gold medallists Laura Trott and Nicola Adams became the latest British athletes to have private information released into the public domain when they featured in the third batch of names whose 'therapeutic use exemptions' (TUEs), held on file by the World Anti-Doping Agency (WADA), were released by cyber espionage group 'Fancy Bears'.
TUEs can be issued to athletes who have an illness or condition which requires the use of medication which is on WADA's prohibited list.
Trott and Adams were joined on the list by swimmer Siobhan-Marie O'Connor and rower Olivia Carnegie-Brown, who both won silver for Team GB at Rio 2016.
There is no suggestion of any wrongdoing by any of the athletes.
UKAD chief executive Nicole Sapstead said: "We absolutely condemn the latest release of personal information pertaining to members of Team GB.
"It is causing unnecessary and unwarranted worry for the athletes affected. We continue to treat this matter with the utmost concern and seriousness, and we are in close contact with WADA."
A WADA statement read: "Stakeholders should know that WADA is being consulted and taking action based on intelligence and advice from the very highest levels of international law enforcement."
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The stand-in president of the Olympic Council of Ireland (OCI) is among those to have his passport seized by police in Rio, Reuters reports citing a police source.
Willie O'Brien temporarily stood in for Patrick Hickey, who has been arrested and detained in Brazil as police investigate an alleged illegal ticketing scam.
But it was reported today that he was among six to have their passports seized as part of the probe, along with three others who have been named as Kevin Kilty, Dermot Henihan and Stephen Martin.
In a statement, the OCI said police had found an allocation of unused Rio 2016 tickets in a raid on their offices in Rio in the early hours of Sunday morning.
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Three members of the Olympic Council of Ireland (OCI) have had their passports seized by police in Rio as part of an investigation into illegal ticket touting.
The Irish Times reports that officers raided the officials' hotel rooms and took mobile phones, computers and tickets in the early hours of the morning.
The men, named by police sources as Kevin Kilty, Dermot Henihan and Stephen Martin, will have to remain in Rio until Tuesday for questioning.
It comes after the arrest and detention of Patrick Hickey - head of the European Olympic Committee and an International Olympic Committee (IOC) member - along with Kevin Mallon of hospitality firm THG Sports, which has also been implicated in the case.
Police are investigating an alleged scheme to pass OCI tickets to THG via the OCI's official ticket vendor Pro10, in a bid to get around Rio organisers' decision to reject THG's application to be the official vendor.
Mr Hickey, Pro10 and THG have all denied any wrongdoing.
The International Olympic Committee (IOC) member arrested in Brazil over suspected illegal ticket sales is sharing a jail cell with an executive from the sports hospitality company also implicated in the case, prison bosses said.
Authorities said Patrick Hickey had been given a cell with Kevin Mallon of hospitality firm THG Sports.
The men have been given the same treatment as other inmates at the maximum-security Bangu complex, officials added - including a standard haircut and prison fare.
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